And the father warned the alleged perpetrators: “With the police and through the power of social media we will catch you.”

Police stepped up patrols in the area after the incident, just after noon on Saturday, and are hunting two people in connection with it.

The first is described as white, with a bald head, short facial stubble and aged in his 30s. He was wearing a black T-shirt and black trousers.The second man is described as white, aged in his mid-30s, with brown hair. He was wearing a blue T-shirt.

Detective Chief Inspector Denise Johnson said: "High visibility patrols have been increased in the area to provide reassurance to the local community. I would always ask parents to remind children about the importance of not talking to or going with strangers."